| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D030715.2 | SGP/SIRS/E5 - Downwelling direct normal (NIP) reporting low | sgpsirsE5.00, sgpsirsE5.b1, sgpsirs20sE5.a0 |
| D040205.1 | SGP/SIRS/E1/E2/E3/E5/E8 - Snow on Radiometers | sgpsirsE1.00, sgpsirsE1.b1, sgpsirsE2.00, sgpsirsE2.b1, sgpsirsE3.00, sgpsirsE3.b1, sgpsirsE5.00, sgpsirsE5.b1, sgpsirsE8.00, sgpsirsE8.b1, sgpsirs20sE1.a0, sgpsirs20sE2.a0, sgpsirs20sE3.a0, sgpsirs20sE5.a0, sgpsirs20sE8.a0 |
| D040320.1 | SGP/SIRS/E5 - anomalously low NIP readings | sgpsirsE5.00, sgpsirsE5.b1, sgpsirs20sE5.a0 |
| D040420.2 | SGP/SIRS/E5 - Dirt on PSP Dome | sgpsirsE5.00, sgpsirsE5.b1, sgpsirs20sE5.a0 |
| D050131.26 | SGP/SIRS/E5 - Ice storm | sgpsirsE5.b1, sgpsirs20sE5.a0 |
| D050131.27 | SGP/SIRS/E6 - Ice storm | sgpsirsE6.b1, sgpsirs20sE6.a0 |
| D050205.2 | SGP/SIRS/E6 - Questionable data due to Ice Storm damage | sgpsirsE6.00, sgpsirsE6.b1, sgpsirs20sE6.a0 |
| D060630.13 | SGP/SIRS/E5 - Reprocessed: Longwave Calibration error | sgpsirsE5.b1 |
| D060630.14 | SGP/SIRS/E6 - Reprocessed: Longwave Calibration error | sgpsirsE6.b1 |
| D070205.2 | SGP/SIRS/E5 - Dirty radiometers | sgpsirsE5.00, sgpsirsE5.b1, sgpsirs20sE5.a0 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/11/2003 | 1630 | 07/16/2003 | 1840 |
| Subject: | SGP/SIRS/E5 - Downwelling direct normal (NIP) reporting low |
| DataStreams: | sgpsirsE5.00, sgpsirsE5.b1, sgpsirs20sE5.a0 |
| Description: | There were large differences between the measured downwelling
shortwave (DS) and the downwelling shortwave calculated from direct
(NIP) and diffuse (DD) readings. It appears that the direct normal
shortwave readings were much too low, particularly on 7/14 and 7/15.
It appears that the diffuse instrument was being shaded properly, but
the NIP was not tracking the sun.
The problem was corrected during the preventative maintenance visit on
7/16/03 at 1840GMT. The technician reported doing the quarterly
connection corrosion checks and ventilator fan cleaning, the NIP was
described as having "dry-light dust" on the window, no mention of
tracker alignment was made. Although uncertain, a bad connection at
some point in the instrument wiring was likely to blame and was
eliminated during the corrosion inspection process. |
| Measurements: | sgpsirsE5.b1:
sgpsirs20sE5.a0:
sgpsirsE5.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/02/2004 | 1200 | 02/02/2004 | 2000 |
| Subject: | SGP/SIRS/E1/E2/E3/E5/E8 - Snow on Radiometers |
| DataStreams: | sgpsirsE1.00, sgpsirsE1.b1, sgpsirsE2.00, sgpsirsE2.b1, sgpsirsE3.00, sgpsirsE3.b1, sgpsirsE5.00, sgpsirsE5.b1, sgpsirsE8.00, sgpsirsE8.b1, sgpsirs20sE1.a0, sgpsirs20sE2.a0, sgpsirs20sE3.a0, sgpsirs20sE5.a0, sgpsirs20sE8.a0 |
| Description: | A large discrepancy between the measured values of downwelling hemispheric shortwave radiation and the derived values occurred on 2/02 at the listed sites. The difference is on the order of 200 Wm^(-2) at E2 and to a lesser extent at the other affected stations. This problem most likely resulted from a previous day or night snow/ice accumulation on the Direct(NIP), Downwelling Sortwave(PSP) and/or Downwelling Diffuse(8-48) instruments. During the morning hours of 02/02, Approx 1300-2000GMT, snow/ice was covering one or more of these three instruments resulting in faulty readings and incorrect derived downwelling shortwave values as well. Instrument readings indicate the problem resolved itself later in the day through normal meltoff. |
| Measurements: | sgpsirs20sE5.a0:
sgpsirsE2.b1:
sgpsirsE1.00:
sgpsirsE2.00:
sgpsirs20sE3.a0:
sgpsirsE3.b1:
sgpsirs20sE1.a0:
sgpsirsE8.00:
sgpsirsE3.00:
sgpsirsE5.b1:
sgpsirsE1.b1:
sgpsirsE5.00:
sgpsirs20sE2.a0:
sgpsirs20sE8.a0:
sgpsirsE8.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/17/2004 | 1843 | 03/28/2004 | 0300 |
| Subject: | SGP/SIRS/E5 - anomalously low NIP readings |
| DataStreams: | sgpsirsE5.00, sgpsirsE5.b1, sgpsirs20sE5.a0 |
| Description: | Direct normal (NIP instrument) irradiance readings fall anomalously on 3/17 18:43GMT to less than half the expected values during clear sky conditions. NIP readings returned to normal on 3/28/04 12:00. Maintenance on 3/29/04 19:48 revealed no unusual contaminents. Precipitation on 3/27 (measured by the SMOS system) probably cleared the NIP window of contaminents before scheduled maintenance. |
| Measurements: | sgpsirsE5.b1:
sgpsirs20sE5.a0:
sgpsirsE5.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/11/2004 | 1200 | 05/05/2004 | 1645 |
| Subject: | SGP/SIRS/E5 - Dirt on PSP Dome |
| DataStreams: | sgpsirsE5.00, sgpsirsE5.b1, sgpsirs20sE5.a0 |
| Description: | The PSP dome was dirty. The magnitude of differences from derived
vs. measured values of downwelling shortwave were about 75 W/m^2.
Preventative maintenance on 4/21 cleaned instruments but they
became dirty again immediately afterward and continued to be
so until the next PM on 5/5. |
| Measurements: | sgpsirsE5.b1:
sgpsirs20sE5.a0:
sgpsirsE5.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/04/2005 | 2202 | 01/12/2005 | 2002 |
| Subject: | SGP/SIRS/E5 - Ice storm |
| DataStreams: | sgpsirsE5.b1, sgpsirs20sE5.a0 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirsE5.b1:
sgpsirs20sE5.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/05/2005 | 0202 | 01/09/2005 | 1630 |
| Subject: | SGP/SIRS/E6 - Ice storm |
| DataStreams: | sgpsirsE6.b1, sgpsirs20sE6.a0 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirs20sE6.a0:
sgpsirsE6.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/13/2005 | 1200 | 02/10/2005 | 1700 |
| Subject: | SGP/SIRS/E6 - Questionable data due to Ice Storm damage |
| DataStreams: | sgpsirsE6.00, sgpsirsE6.b1, sgpsirs20sE6.a0 |
| Description: | Several SIRS readings at E6 readings have appeared questionable since the ice storm in early January. Starting on 01/13 maintenance found the E6 tracker inoperative. It was reset and put back into serivice. Shortly after, on 01/16 data from the DSH instrument (PSP) became questionable possibly due to obstructed or failed ventilator fan. On 02/10 1645 GMT maintenance found the DSH instrument ventilator fan failed - the fan was replaced, the E6 tracker was also realigned. Due to early january ice storms, the tracker alignment issues and a failed ventilator fan - All tracker mounted and global DS instrument measurements are suspect for this time frame. |
| Measurements: | sgpsirs20sE6.a0:
sgpsirsE6.00:
sgpsirsE6.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/10/2004 | 2030 | 02/22/2006 | 1817 |
| Subject: | SGP/SIRS/E5 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsE5.b1 |
| Description: | Modified pyrgeometer calibration procedures were implemented beginning in March 2004. These modified procedures introduced a calibration bias in the longwave data. The previous procedures were re-implemented at all sites between December 2005 and February 2006 to restore proper calibrations. The data collected while the incorrect procedures were in place have been reprocessed to remove the calibration bias. The reprocessed 60 second averaged data are based on 3 instantaneous 20 second data records rather than on 60 1 second instantaneous data records. Still, these data are considered far superior to the originally processed data. The reprocessed data were archived in October 2006. |
| Measurements: | sgpsirsE5.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/11/2004 | 1610 | 02/09/2006 | 1553 |
| Subject: | SGP/SIRS/E6 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsE6.b1 |
| Description: | Modified pyrgeometer calibration procedures were implemented beginning in March 2004. These modified procedures introduced a calibration bias in the longwave data. The previous procedures were re-implemented at all sites between December 2005 and February 2006 to restore proper calibrations. The data collected while the incorrect procedures were in place have been reprocessed to remove the calibration bias. The reprocessed 60 second averaged data are based on 3 instantaneous 20 second data records rather than on 60 1 second instantaneous data records. Still, these data are considered far superior to the originally processed data. The reprocessed data were archived in October 2006. |
| Measurements: | sgpsirsE6.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/23/2007 | 1500 | 01/30/2007 | 0000 |
| Subject: | SGP/SIRS/E5 - Dirty radiometers |
| DataStreams: | sgpsirsE5.00, sgpsirsE5.b1, sgpsirs20sE5.a0 |
| Description: | Snow or heavy dirt may have been covering one side of the PSP or 8-48 domes. The start of the problem coincides with a preciption event. We may assume that the offending substance was snow and it melted by 1/30/2007. PM after this time reports dry-light dust on radiometers. |
| Measurements: | sgpsirsE5.b1:
sgpsirs20sE5.a0:
sgpsirsE5.00:
|